Naming and coding style convention, new linter tool. (#945)

* Makefile, Scripts: new linter
* About: remove ID from IC
* Firmware: remove double define for DIVC/DIVR
* Scripts: check folder names too. Docker: replace syntax check with make lint.
* Reformat Sources and Migrate to new file naming convention
* Docker: symlink clang-format-12 to clang-format
* Add coding style guide

firmware/targets/furi_hal_include/furi_hal_delay.h

@@ -0,0 +1,41 @@
+/**
+ * @file furi_hal_delay.h
+ * Delay HAL API
+ */
+
+#pragma once
+
+#include "main.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Init DWT
+ */
+void furi_hal_delay_init(void);
+
+/** Delay in milliseconds
+ * @warning    Cannot be used from ISR
+ *
+ * @param[in]  milliseconds  milliseconds to wait
+ */
+void delay(float milliseconds);
+
+/** Delay in microseconds
+ *
+ * @param[in]  microseconds  microseconds to wait
+ */
+void delay_us(float microseconds);
+
+/** Get current millisecond
+ * 
+ * System uptime, pProvided by HAL, may overflow.
+ *
+ * @return     Current milliseconds
+ */
+uint32_t millis(void);
+
+#ifdef __cplusplus
+}
+#endif